Conductive welding material and method for producing same

Abstract

Disclosed is a welding material made of a fluororesin composition in which carbon nano tubes are dispersed in a fluororesin, wherein the fluororesin composition includes 0.01 to 2.0% by mass of the carbon nano tubes.

1 . A welding material made of a fluororesin composition in which carbon nano tubes are dispersed in a fluororesin, wherein the fluororesin composition comprises 0.01 to 2.0% by mass of the carbon nano tubes. 
     
     
         2 . The welding material according to  claim 1 , wherein the carbon nano tubes have an average length of 50 μm or more. 
     
     
         3 . The welding material according to  claim 1 , which has a volume resistivity of 1×10 −1  to 1×10 8  Ω·cm. 
     
     
         4 . The welding material according to  claim 1 , wherein the fluororesin comprises at least one selected from polytetrafluoroethylene (PTFE), modified polytetrafluoroethylene (modified PTFE), tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene/hexafluoropropylene copolymer (FEP), ethylene/tetrafluoroethylene copolymer (ETFE), ethylene/chlorotrifluoroethylene copolymer (ECTFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF) and polyvinyl fluoride (PVF). 
     
     
         5 . The welding material according to  claim 1 , wherein the fluororesin in the fluororesin composition has an average particle size of 500 μm or less. 
     
     
         6 . The welding material according to  claim 1 , which is used in a bonding part between a fluororesin and a fluororesin. 
     
     
         7 . A fluid treatment apparatus comprising the welding material according to  claim 1  in a bonding part between a fluororesin and a fluororesin. 
     
     
         8 . A semiconductor manufacturing apparatus, a pharmaceutical manufacturing apparatus, a pharmaceutical delivery apparatus, a chemical manufacturing apparatus or a chemical delivery apparatus, each comprising the fluid treatment apparatus according to  claim 7 . 
     
     
         9 . A method for producing the welding material according to  claim 1 , the method comprising:
 compression-molding a fluororesin composition in which carbon nano tubes are dispersed in a fluororesin.   
     
     
         10 . A method for producing the welding material according to  claim 1 , the method comprising:
 preparing a fluororesin composition in which carbon nano tubes are dispersed in a fluororesin selected from PTFE and modified PTFE;   placing the fluororesin composition in a mold, pressurizing and compressing the fluororesin composition to produce a pre-molded body;   calcining the pre-molded body at a temperature equal to or higher than a melting point of the fluororesin composition to produce a molded body; and   processing the molded body to produce a welding material.   
     
     
         11 . A method for producing the welding material according to  claim 1 , the method comprising:
 preparing a fluororesin composition in which carbon nano tubes are dispersed in a fluororesin other than PTFE and modified PTFE;   heating the fluororesin composition, pressurizing and compressing the fluororesin composition to obtain a molded body; and   processing the molded body to obtain a welding material.